1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b6a74ed56b3615f2ee95948e22d9970b51d3c2c52c9e5701b9a2524b2a68ef. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4772220b-088e-4211-b377-e5cc62401214.json and https://artists.proofprofile.net/proofs/artist/4772220b-088e-4211-b377-e5cc62401214.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem in D Minor, VB 1: IV. Dies irae, dies illa solvet saeclum in favilla
Kraus: Miserere in C Minor, Requiem in D Minor & Stella coeli in C Major
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc488a0958ea4bf4bcb4241ba61ecaefc41af0dc506c028f33c78c3d11eca9b43. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200840917.
Requiem in D Minor, VB 1: VI. Huic ergo parce Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9989963ca215a6e57a1d0d3de48706bd4b2e0b03ee5661a446f2c0189f21b59. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200840919.
Requiem in D Minor, VB 1: IX. Sanctus, sanctus, sanctus Domine Deus Sabaoth
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f59932f16489bf36cc17cda8d47c066bdd6ccc17ab3edbdab893ef926dff788. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200840922.
Requiem in D Minor, VB 1: XI. Agnus Dei qui tollis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27636fa3389bf5d4beb1d02afc2d11927ac73252e860bd2bed0df755daae88b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200840924.
Requiem in D Minor, VB 1: I. Requiem aeternam dona eis Domine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60be3485d3a7b7ebca99e3bfe64779e938ba4931b721a9c957e0ceb3121ede98. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200840914.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Requiem in D Minor, VB 1: III. Kyrie eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6bddf58e57c960d7e36436141d9c49937ccb621232a8fb1c3298a232ced245. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200840916.
Requiem in D Minor, VB 1: VII. Domine Jesus Christe rex gloriae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ab895dded7a4d97e724ff034ee0156c92f7269ec38e193762234ebeec2b9cf. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200840920.